Extension-ladder.



No. 7|3,550. Patented Nov. H,- I902.

w. ZOTTMAN.

EXTENSION LADDEB.

,(Application filed June 29, 1900;

(No Model.)

UNiTnn STATns PATENT OFFICE;

\VILLIAM ZOTTMAN, OF BURLINGTON, VERMONT.

sx'rsnsionmaouss.

SEECIFICATION forming part of Letters Patent No. 713,550, dated November1 1, 1902.

Application filed June 29,1900. Serial No. 22,045. (No model.)

To alt whom it 77mg concern.-

Be it known that I, WILLIAM ZOTTMAN, a citizen of the United States,residing in the city of Burlington, in the county of Chittenden andState of Vermont, have invented a new and useful Improvement inExtension- Ladders, of which the following is a specification.

My invention relates to an extension-ladder made in two or threesections and may be extended by ropes and pulleys and held at any pointdesired.

My object is to have a ladder that will hold a man and be light enoughto be easily and readily handled.

In the accompanyingdrawings similar characters refer to similar parts inall the views.

Figure 1 shows a ladder in three sections 1 2 8. Fig. 2 shows twosections, somewhat enlarged, with the mechanism for extending the same.Fig. 3 shows pipe B, the coupler L, the T C over the bolt 72. Fig.eshows the pawl. Fig.5 shows the stop A, with the spring N to bring itto place. Fig. 6 shows the bracket G to hold the lower end of thesection in place; Fig. 7, a bracket to hold the upper end of the sectionin place. Fig. 8 is an end view of the three sections when not extended.Fig. 9 shows the pawl with the spring E.

The pawl is attached to the rung next to the lower rung of the sections2 and 3. The spring E is attached to the rung next below the pawl. Apulley-block m is attached to the same rung, with a cord running toanother, J, in the upper end of the section next below to extend thesame when desired. When a section is extended as far as desired, theforked end of the pawl rests on the rung that it has last passed overand holds the section up firmly in place. When it is desired to let theextended section down, it is pulled up a little. The spring E pushesagainst the pawl, as shown in Fig. 2 and also in Fig. 9, and will throwthe pawl out clear from the rung, and as the ladder-section goes downthe upper end of the pawl will strike the rung and be reversedthat is,the end attached to the T will go down first and the forked end will beuppermost as it strikes each rungand so soon as the section is pulled upagain the pawl will assume its former position, with the forked end downand the end attached to the T uppermost. When the upper end of the pawlis bent, as shown in Fig. 4, it will swing clear of the rung without theuse of the spring E.

Fig. 3 shows the bolt 01, which passes through ordinary ladder sides,also through the pipe B, the coupler L,- and the T O, which altogetherforms a rung of the ladder, to which the pawl may be attached byscrewing it into the T O.

The bolt '11 is made of iron; but an ordinary rung made of wood may bepassed through the T C and ladder sides, audit will work equally well,although perhaps not quite as strong and durable, but is much cheaper.

The brackets G and H are not necessary in working this ladder.

A is a stop attached to the upper end of a section, as shown in Fig. 2,and is Worked by a small cord A, attached to the upper end and runningover a pulley A When a section is extended nearly to its limit, the stopholds it from going higher; but in order to let it down the stop Fstrikes against the stop A and is removed by pulling the cord A, andthen the extended section will go a little higher, so that the pawl willbe detached from the rung on which it rests and that section will thengo down freely.

N is a spiral spring to bring the stop back to its place. A fiat springmay be used instead. Section 2 runs inside of section 1 and is held bymeans of the brackets H G and runs in a groove, so as to move freely upand down. In like manner section 3 runs inside of section 2.

I claim 1. The combination of the ladder-sections, pulleys and cord toextend the same, a pivoted stop, a spring attached to one end of saidstop, a cord attached to the other end of said stop, a fixed lug or stopon the adjacent section with which the stop cooperates, a T mounted onone of the rungs, and a pawl having a forked end screwed to said T,substantially as described.

2. -In combination with the ladder sides and a series of ordinary rungs,a bolt passed through said sides, a pipe over said bolt, a T on saidpipe and a pawl secured to said T, substantially as described.

WVM. ZOTTMAN.

Witnesses:

O. P. RAY, P. 0. RAY.

